<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
	<script src="jquery-1.12.4.js"></script>
</head>
<body>
<input type="button" id="btu" value="点击">
<br>
<ul id="chi">
	<li id="lzj">辣子鸡</li>
	<li>香酥鸭</li>
	<li>红烧肉</li>

</ul>
<script>
	$('#btu').click(function () {
		$('#lzj').clone().appendTo('#chi');
	})
</script>

</body>
</html>